Rail-bond.



W. B. NOBLE & D. K. 'DABAGHIAN. RAIL BOND. APPLICATION FILED AUG. 24, 1910.

Patented June 6, I911.

MLLl/YMB. MEL 5 Inn/m Disma /4N WILLIAM BL'NOIBLE AND DIKRAN K. DABAGHIAN, OF OAKLAND, CALIFORNIA, ASSIGN FAT ENE @FFIQH.

OBS TO N. & D. MANUFACTURING C0.,'A CORPORATION OF CALIFORNIA.

RAIL-BOND.

Specification of Letters Patent. Patented June 6, 1911.

Application filed August 24, 1910. Serial No. 578,616.

To all whom it may concern:

Be it known that we, WILLIAM B. NOBLE and DIKRAN K. DABAGHIAN, citizens of the United States, residing at Oakland, in the county of Alameda, State of California, have invented certain new and useful Improvements in Rail-Bonds; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. r

This invention relates to rail bonds such as are used for the 'purpose of establishing electrical'conneetion between the ends of adjacent rails ,of electric railways and other systems whereinthe rail is employed for the purpose of a conductor.

One object of the invention is to provide an improved form of rail bond in which the head may be repeatedly used, the plug used for connectingthe bond to a rail being renewable. I

With the above and other objects in View, the invention consists in general of a rail bond provided with a renewable plug and means to secure the connecting wires, the whole being of novel and improved construction; I

The invention further consists in certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings, and=specifically set forth in the claims.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and Figure 1 is a face view of a rail bond as constructed under this invention. Fig. 2 is a back view of one of the ends of said bond. Fig. 3 is a section on the line 3-3 of Fig. 2. Figj' i'is a face view of a modified form of rail'bond. Fig. 5 is a back view of one end of the modification. Fig. 6 is a section on the line 6-6 of Fig. 5.

In the form shown in Figs. 1, 2 and 3, this bond is provided with two heads of like form and these heads each comprises a plate of conducting metal 10, the outer face whereof presents a smooth and unbroken surface. This plate is preferably shaped somewhat in the form of the heel of a shoe but is provided with the-inner surface of the plate 10. .Ad-

jacent the opposite end of the plate-10 there is provided ath'readed opening liwherein .is held the threaded end 15 of a plug 16 which is provided with a collar 17 adapted to bear against theinner face of the plate 10. Thebody of-this plug 16 is of cylindrical form and extending through the plug is a centrally'disposed opening 18. This plug is adapted to fit in the usual bonding hole made in the end of a rail and when so inserted is expanded by driving a driit pin into the opening 18 so that it is held firmly in connection with said rail.- The plug 16 is made of relatively soft conductingmaterial, this material preferably being copper of a high grade of puritywhile-the pl-ate'lO is made of relatively hard conducting material, it being preferably of brass or bronze. The-object in this is to permit renewals of the plug 16 without injury to the threads of the Zopening 14. It is to be understood that when the plug 16 is inserted and expanded as described it is generally impossible to remove it without so injuring it that it cannot be employed a second time. This, where the plug and head are made integral, makes it necessary to provide an entirely new head and to secure the bonding wires to that new head. With the present invention it is suflicient to provide a new plug and the wires may beleft attached to the old head and used repeatedly.

It'is to be noted that by means of the open slot herein described the wires may. be soldered securely to the head so that there is no possibility of their becoming detached and that this soldering gives a joint between the wires and head of a high degree of con-' with a projection 11 at its forward end, this being the end directed toward the opposite'f have sufficient cross sectionah area to make .105 up for the lower specific conductivity so that the total conductivities of the plug, head and wires will equal each other.

In the form shown in Figs. 4, 5 and 6 there is provided two heads of like form and these heads each comprises a plate of conducting material 20 having a neck 21 bent upward and outward from the face of the plate and provided with a recess 22. This plate 20 is furthermore provided with a threaded opening 23 adjacent the end of the plate opposite the neck. In the threaded opening 23 is held the threaded end 24 of a plug 25 which is provided with a collar 26 adapted to bear against the inner face of the plate 20. The body of this plug 25 is of cylindrical form and extending through the plug is a centrally disposed opening 27. This plug, like that previously described, is adapted to fit in the usual bondihg hole near the end of a rail and when so inserted is expanded by driving a drift pin into the opening 27 so that the plug is held firmly in connection with said rail., Connecting the two headsthus formed is a bonding cable 28 the ends of which are received into the recess 22 of the respective heads and are held in said recess by suitable solder. The plug 25 is made of relatively soft conducting material, this material preferably being like the other of copper of a high grade of purity while the plate 20 is made of relatively hard conducting material, it being preferably of brass, bronze or the like. The object of this construction is precisely that previously de-- scribed.

There has thus been provided a simple and etlicient device ofthe kind described and for the purpose specified Having thus described the invention,what

is claimed as new, is

1. In a rail bond, a head of relatively hard material of high conductivity, and an attaching plug of relatively soft material of high conductivity screwed into said head.

2. In a rail bond, a head of relatively hard material of high conductivity, and a hollow expansion plug of relatively soft material of high conductivity screwed intosaidhead.

3. In a rail bond, a head comprising a flat oblong plate having an under surface adapted to bear against a rail, said plate having a threaded opening adjacent one end and a transverse wire receiving groove formed in its under surface adjacent the otherend, and a hollow expansion plug having a threaded end screwed into said opening.

4. In a rail bond, a head comprising a body portion having a reduced end, said body having a threaded opening therethrough and being provided with an under surface adapted to bear against a rail, said head having an arcuate transverse groove immediately adjacent the reduced end with the concave side of the groove facing the reduced end, a hollowexpansion plug having a threaded end screwed into said opening, and a series of conductor wires secured in said groove.

In testimony whereof, we afiix our signatures in presence of two witnesses.

WILLIAM B. NOBLE. DIKRAN K. DABAGHIAN.

Witnesses:

GRACE A. Bosoon, JoHN G. YOUNG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

